| 摘要 |
A unique system and process for producing an improved refiner groundwood from a great variety of raw fibrous material including both softwoods, hardwoods and their waste residuals, characterized by a multi-stage disc refining of the raw materials. The first stage refining is effected in a pressurized environment and features an absence of liquid except for that moisture embodied in the raw material per se in delivery to the refiner. The first stage refining is conducted under controlled conditions providing a moderate elevated pressure and subsequent disc refining is effected under atmospheric pressure conditions. The unique result is a bright fiber yield equal to that available in straight atmospheric refining. More importantly, the yield is achieved with a minimum of power. A most significant result of the invention process is an unexpected reduction in bulk of the fiber furnished.
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